Motor and blow device using the same

1 . A motor comprising:

an air guide member having a center frame and a plurality of air guide fins arranged at intervals on outer periphery of the center frame, each two adjacent air guide fins define a first air channel, a plurality of the first air channels form an air guide area;

a stator assembly having a stator yoke and a plurality of stator teeth, the stator teeth are connected to inner wall of the stator yoke and are arranged at intervals along circumferential direction of the stator yoke, each two adjacent stator teeth define a second air channel, a plurality of the second air channels form a heat dissipation area;

a housing having an receiving cavity extending through axial direction of the motor to receive the stator assembly and the air guide member;

an air outlet member located at an end of the stator assembly away from the air guide member and connected to the housing, the air outlet member having an outlet area;

a rotor rotatably arranged within the stator assembly, the rotor having a shaft, one end of the shaft is extended from the stator assembly and passed through the air guide member, another end of the shaft is extended from the stator assembly and passed through the air outlet member;

a preload support assembly having a first preload unit and a second preload unit respectively located on both sides of the stator assembly, the first preload unit and the second preload unit are both connected to the shaft to form opposing forces; and

an impeller arranged on the side of the air guide member away from the stator assembly and connected to the shaft, wherein the ratio of the maximum diameter of the inner wall of the stator yoke to the maximum outer diameter of the impeller is between 0.8-1.2;

wherein the air guide area, the heat dissipation area and the outlet area together form an only air channel of the motor, air flow generated by the driven impeller is guided by the air guide area and completely passed through the heat dissipation area, and flowed out from the outlet area;

wherein the first preload unit and the air outlet member are arranged on the same side of the stator assembly, the first preload unit includes an elastic member and a first bearing arranged on the shaft, one end of the elastic member is resisted on the air outlet member, another end of the elastic member is resisted on the first bearing;

wherein the air outlet member comprises a center seat, shell and a plurality of support parts connected between the shell and the center seat, each two adjacent support parts define a outlet, the number of the stator teeth is 6, the number of air guide fins is between 6 and 12, and the number of support parts is between 2 and 6.

2 . The motor of claim 1 , wherein the first bearing comprises an inner part, an outer part and balls arranged between the inner part and the outer part, the inner part is fixed on the shaft, the end of the elastic member is resisted on the outer part.

3 . The motor of claim 1 , wherein the air outlet member comprises a center seat, the outlet area is distributed around the center seat, the side of the center seat facing the stator assembly is provided with an accommodating groove, the elastic member is received in the accommodation groove.

4 . The motor of claim 3 , wherein the air outlet member comprises a shell connected to the housing and a plurality of support parts connected between the shell and the center seat, the support parts are arranged at intervals along the circumferential direction of the center seat, each two adjacent support parts define a outlet, a plurality of the outlets form the outlet area.

5 . The motor of claim 4 , wherein the shell is connected with the housing by means of thread or snap.

6 . The motor of claim 1 , wherein the second preload unit and the air guide member are arranged on the same side of the stator assembly, the second preload unit includes a second bearing arranged on the shaft, the side of the second bearing away from the stator assembly is resisted on the air guide member.

7 . The motor of claim 6 , wherein the second preload unit comprises a third bearing located on a side of the second bearing facing the stator assembly, the third bearing is disposed adjacent to the second bearing along the axial direction of the shaft.

8 . The motor of claim 7 , wherein a receiving groove is opened on side of the center frame facing the stator assembly, the second bearing and the third bearing are both located in the receiving groove.

9 . The motor of claim 1 , wherein the stator assembly comprises a plurality of stator windings around the stator teeth in one-to-one correspondence, cross-sectional area of one stator tooth wound by the stator winding is less than or equal to one-half of cross-sectional area of flow channel formed between two adjacent stator teeth wound by the stator winding.

10 . The motor of claim 1 , wherein a first position part is arranged on inner wall of the end of the housing away from the air guide member, a second position part is arranged on outer wall of the stator yoke, the stator assembly is positioned in the housing through the nesting of the first position part and the second position part.

11 . The motor of claim 10 , wherein the first position part is a position slot which is arranged along axial direction of the housing, the second position part is a position protrusion which is protruding along the axial direction of the rotor.

12 . The motor of claim 11 , wherein length of the position protrusion is less than or equal to length of the position slot.

13 . The motor of the claim 1 , wherein the air guide fins are arranged at least partially inclined on outer wall of the center frame relative to the axial direction of the center frame.

14 . The motor of claim 13 , wherein inclination of part of the air guide fin adjacent to the impeller is greater than inclination of part of the air guide fin adjacent to the stator assembly.

15 . The motor of claim 13 , wherein the air guide member and the housing are integrated, end of the air guide fin away from the center frame is connected to inner wall of the housing.

16 . The motor of claim 1 , wherein the housing comprises a first housing part configured to accommodate the air guide member and a second housing part configured to accommodate the stator assembly, the outside diameter of the first housing part is less than the outside diameter of the second housing part.

17 . The motor of claim 1 , wherein the stator assembly comprises a plurality of the stator windings wound around the stator teeth in one-to-one correspondence, ratio of length of the stator teeth along the radial direction of the stator yoke to width of the stator windings along the circumference of the stator yoke is greater than or equal to 2.